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/*
* iemmatrix
*
* objects for manipulating simple matrices
* mostly refering to matlab/octave matrix functions
*
* (c) IOhannes m zmölnig, forum::für::umläute
*
* IEM, Graz
*
* this code is published under the LGPL
*
*/
#include "iemmatrix.h"
/*
mtx_distance2: gets the euclidian distances (squared) between 2 sets of n-dimensional vectors
*/
/* -------------------------------------------------------------- */
/* matrix math */
/* mtx_distance2 */
static t_class *mtx_distance2_class;
static void mtx_distance2_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
{
int row=atom_getfloat(argv);
int col=atom_getfloat(argv+1);
int row2=0, col2=0;
t_atom *m;
t_atom *m1 = argv+2;
t_atom *m2 = x->m2.atombuffer+2;
int i, j;
if (argc<2){
post("mtx_distance2: crippled matrix");
return;
}
if ((col<1)||(row<1)) {
post("mtx_distance2: invalid dimensions");
return;
}
if (col*row>argc-2){
post("sparse matrix not yet supported : use \"mtx_check\"");
return;
}
row2=x->m2.row;
col2=x->m2.col;
if (!(col2*row2)) {
/* 2nd matrix is NULL; take the 1st matrix instead (distance between it's own vectors) */
m2=argv+2;
row2=row;
col2=col;
} else if (col!=col2){
post("mtx_distance2: matrix dimensions do not match");
return;
}
adjustsize(&x->m, row, row2);
m = x->m.atombuffer+2;
for(i=0; i<row; i++)
for(j=0; j<row2; j++){
t_float f=0.f;
int c1=col*i;
int c2=col*j;
int n;
for(n=0; n<col; n++){
t_float x=atom_getfloat(&m1[c1+n])-atom_getfloat(&m2[c2+n]);
f+=x*x;
}
SETFLOAT(m,f);
m++;
}
outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), row*row2+2, x->m.atombuffer);
}
static void *mtx_distance2_new(void)
{
t_mtx_binmtx *x = (t_mtx_binmtx *)pd_new(mtx_distance2_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
outlet_new(&x->x_obj, 0);
x->m.col = x->m.row = x->m2.col = x->m2.row = 0;
x->m.atombuffer = x->m2.atombuffer = 0;
return(x);
}
void mtx_distance2_setup(void)
{
mtx_distance2_class = class_new(gensym("mtx_distance2"),
(t_newmethod)mtx_distance2_new, (t_method)mtx_binmtx_free,
sizeof(t_mtx_binmtx), 0, A_NULL, 0);
class_addmethod(mtx_distance2_class, (t_method)mtx_distance2_matrix, gensym("matrix"), A_GIMME, 0);
class_addmethod(mtx_distance2_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
class_addbang (mtx_distance2_class, mtx_binmtx_bang);
class_sethelpsymbol(mtx_distance2_class, gensym("iemmatrix/mtx_distasnce2"));
}
void iemtx_distance2_setup(void)
{
mtx_distance2_setup();
}
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